External window + engine window problem

#include <acknex.h>
#include <windows.h>
#include <strio.c>
#include <default.c>

//--------------------------------------------------

#define LPWSTR char*
#define MAKEINTRESOURCEW(i) (LPWSTR)((DWORD)((WORD)(i)))
#define MAKEINTRESOURCE MAKEINTRESOURCEW
#define IDI_WINLOGO MAKEINTRESOURCE(32517)
#define BTN1 4000
//--------------------------------------------------

LRESULT CALLBACK WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

//--------------------------------------------------

HWND hWnd1;
char cname[4] = {0x62, 0x6C, 0x61, 0};

//--------------------------------------------------

void controles();

void fwhile (){ 
	var x1 = 100;
	var x2 = 400;
	var y1 = 100;
	var y2 = 400;
	while(1){
		x2 += (-1 + random(1.99)) * 5;
		
		x1 += (-1 + random(1.99)) * 5;
		draw_line(vector(x1,y1,0),NULL,100); 
		draw_line(vector(x2,y1,0),vector(0,0,255),100);  
		draw_line(vector(x2,y2,0),vector(0,0,255),100); 
		draw_line(vector(x1,y2,0),vector(0,0,255),100); 
		draw_line(vector(x1,y1,0),vector(0,0,255),100);wait(1);
	}
}

void main ()
{
	d3d_lockable = 1;

	wait(1);
	video_window(vector(sys_metrics(0)/3.2,1,0),0,1,0);
	screen_color.blue = 255;
	screen_color.green = 128;

	fwhile();
	
	//--------------------------------------------------------
	WNDCLASS wc;
	wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc = WndProc2;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon (NULL, IDI_WINLOGO);
	wc.hCursor = LoadCursor (NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH) GetStockObject (BLACK_BRUSH);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = cname;
	RegisterClass (&wc);
	
	hWnd1 = CreateWindowEx
	(
	0,
	cname,
	"3D Pressenter",
	(WS_OVERLAPPEDWINDOW | WS_SYSMENU) - (WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_THICKFRAME),
	00, 00, 400, 600,
	hWnd,
	0,
	hInstance,
	0
	);

	ShowWindow   (hWnd1, SW_SHOWNORMAL);
	
	//---------------------------------------------
	controles();
	MSG msg;

}

void controles(){
	
	long hMenu = CreateMenu();
	long hSubMenu = CreateMenu();
	InsertMenu(hSubMenu,1,MF_BYPOSITION|MF_STRING,1,"Play");
	InsertMenu(hSubMenu,2,MF_BYPOSITION|MF_STRING,2,"Exit");
	InsertMenu(hMenu,0,MF_STRING|MF_POPUP,hSubMenu,"File");
	SetMenu(hWnd1,hMenu);
}



LRESULT CALLBACK WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_LBUTTONDOWN:
		screen_color.red = random(255);
		//sys_exit("");
		//
		case WM_DESTROY:
		sys_exit(NULL);
		//MessageBox(hWnd1,"bye","OK",MB_OK);
		case WM_COMMAND:
		switch (wParam){
			case 1:
			//	media_play("life.wmv", NULL, 100);
			
			case 2:
			sys_exit("");
			
		}
		return 0; 
	}
	return DefWindowProc (hwnd, message, wParam, lParam);
}